/Engine/Source/Developer/MeshReductionInterface/Public/IMeshReductionInterfaces.h
typedef TBaseDelegate_ThreeParams< void, struct [FMeshDescription](API\Runtime\MeshDescription\FMeshDescription) &, struct [FFlattenMaterial](API\Developer\MaterialUtilities\FFlattenMaterial) &, const [FGuid](API\Runtime\Core\Misc\FGuid) > FProxyCompleteDelegate